to minimise celdicconsisting of several lenses, in contact, is commonily ucamera, microscopes and telescopesQ U E S T I O N SDefine 1 dioptre of power of a lens.A convex lens forms a real and inverted image of a needle at a distancof 50 cm from it. Where is the needle placed in front of the convex lenif the image is equal to the size of the object? Also, find the power of thlens.Find the power of a concave lens of focal length 2 m.

to minimise celdicconsisting of several lenses, in contact, is commoni

1.	to minimise celdicconsisting of several lenses, in contact, is commonily ucamera, microscopes and telescopesQ U E S T I O N SDefine 1 dioptre of power of a lens.A convex lens forms a real and inverted image of a needle at a distancof 50 cm from it. Where is the needle placed in front of the convex lenif the image is equal to the size of the object? Also, find the power of thlens.Find the power of a concave lens of focal length 2 m.
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